fix(e7): CI-Gate-Vorbereitung — ruff über app/ von 105 auf 0 Findings bereinigt; 8 echte F821-NameError-Produktionsbugs behoben (external_api stream_chat-Call-Signatur an stream_chat_comm angepasst, agent_runner uuid vor lokalem Import, automation/plugin UserTenant-Import, tasks delete-audit user_id, workflows/engine timedelta, unified_search/contracts Any); py311-kompatibles StepHandler-Alias statt type-Statement; E402/F841 bereinigt; Verifikation 85/89 grün (4 Failures = bekannter Vorbestand BUG-099)

app/plugins/builtins/mail/models.py

@@ -4,7 +4,9 @@ from __future__ import annotations
 
 import uuid
 from datetime import UTC, datetime
+from typing import Any
 
+from pgvector.sqlalchemy import Vector
 from sqlalchemy import (
     JSON,
     Boolean,
@@ -16,14 +18,12 @@ from sqlalchemy import (
     Text,
     UniqueConstraint,
 )
+from sqlalchemy.dialects.postgresql import TSVECTOR
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.core.db import Base, TenantMixin
 from app.models.owned_mixin import OwnedMixin
-from sqlalchemy.dialects.postgresql import TSVECTOR
-from pgvector.sqlalchemy import Vector
-from typing import Any
 
 # --- Mail Accounts (F-MAIL-14, F-MAIL-18) ---